31423444391 has 2 divisors, whose sum is σ = 31423444392. Its totient is φ = 31423444390.

The previous prime is 31423444357. The next prime is 31423444499. The reversal of 31423444391 is 19344432413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31423444391 - 2¹⁰ = 31423443367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31423444301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711722195 + 15711722196.

It is an arithmetic number, because the mean of its divisors is an integer number (15711722196).

Almost surely, 2^31423444391 is an apocalyptic number.

31423444391 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423444391 is an equidigital number, since it uses as much as digits as its factorization.

31423444391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 38.

The spelling of 31423444391 in words is "thirty-one billion, four hundred twenty-three million, four hundred forty-four thousand, three hundred ninety-one".